Determine eligible SampTimingTypes for a given device?

I'm sure that this should be simple, but I can't find the right way to determine if a device supports the synchronization of DAQmx_Val_OnDemand. For example, I can get a list of the modes supported by using DAQmxGetDevAISampModes sample; Is there an equivalent for the types of synchronization?

Ultimately I do simple analog sampling and want to use synchronization to the application as soon as it is available, clock sampling timing also. Thank you in advance for any advice!

QueenSelene,

It is in fact not true.  DAQ hardware will support usually static/on request/timing software acquisition on analog I/o if they were converters a/d SAR.  Devices that contain dela-sigma a/d converters fall into two categories: slow sampled (typically for measures DC strain, temperature, voltage, current, etc.) and fast sampled (typically for dynamic measures of vibration, bridge, audio sensors, etc.).

Delta-sigma sampled slow devices can often be software timed (on request).  Sigma-delta fast sampling devices are usually not able to support this mode.

micahsimonsen,

I see no immediate way to interrogate the task for this mode of synchronization, because, from the point of view driver DAQmx, calendar on demand is not a synchronization mode, but rather a lack of a mode of synchronization.  If you were to query the property you mentioned in your message and got no valid results, you might assume that calendar On Demand is supported because the unit will need support at least one mode of operation (otherwise you could not use it).  However, if you have received results valid (sample clock, HWTSP, etc.), it would be for a period indeterminate as to whether or not your device support on request because there is at least one other valid mode of operation.

Is there a particular set of devices you want to cover in this application?  You might still question the task of the device name, and knowing what you know about the individual devices or device families, determine whether on-demand synchronization is supported.  For example, devices 60xx 61xx, 62xx and 63xx (to the best of my knowledge) should always support synchronization On Demand, while most of the 44xx and 43xx devices will not.  C series becomes much more complicated in terms of numbering systems, but you could apply a similar methodology to maintain a list of devices that support and compares with this list.  According to the extent of the coverage of device you want your application to have, and the complexity of your comparison algorithm could be reduced to a minimum.

Another potentially more robust to treat this way may be to run a fictional task which bed/written one sample on request to see if the task with a particular code errors indicating that the time to demand is not taken in charge.  You can handle this error and continue accordingly.

Kind regards

Tags: NI Hardware

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